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t in (-oo:+oo)
8-((4/3)*t) = -12 // + 12
8-((4/3)*t)+12 = 0
(-4/3)*t+8+12 = 0
20-4/3*t = 0 // - 20
-4/3*t = -20 // : -4/3
t = -20/(-4/3)
t = 15
t = 15
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